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Cornea & Refractive Surgery

Netra Jyoti Kendra - The best cataract hospital in Faizabad / Ayodhya

Cornea & Refractive Surgery

The inability of the eye to accurately focus the rays of light coming from a distance on the retina is called refractive error. The correction of the eye to view the image correctly is refractive surgery which again depends on the condition of the eye.

More About the Different Available Surgeries

  • Myopia, or nearsightedness: clear vision close up but blurry in the distance.
  • Hyperopia, or farsightedness: clear vision in the distance but blurry close up.
  • Presbyopia: inability to focus close up as a result of aging.
  • Astigmatism: focus problems caused by the cornea.

More than one refractive error can occur for ex myopia and astigmatism

  • Glasses are the simplest and most popular way of correcting refractive errors.
  • Contact lens is cosmetically better though the maintenance and cleaning of the lenses may be cumbersome and have to be replaced at regular intervals.
  • Refractive surgeries are increasingly becoming popular with the advent of more predictable laser treatments.


A variety of treatments are available that correct refractive errors by changing the shape of the cornea. Through a process known as Photorefractive Keratectomy (PRK) or Laser Assisted in-Situ Keratomileusis (LASIK), mild to high amounts of nearsightedness is corrected using laser light energy produced by the excimer laser. Across the world, over 2,000,000 nearsighted people now enjoy clearer vision having undergone laser vision correction.

A new, non-laser surgical procedure to correct mild nearsightedness is now available: Corneal Ring Segments. Corneal rings are surgically placed through a tiny incision that is made on the cornea. Once in place, the two arcs flatten the cornea so that light rays can properly focus on the retina. Since the rings are inserted in the outer edge of the cornea, the center of the cornea remains untouched.

LASIK, or laser-assisted in-situ keratomileusis, combines delicate surgical procedures and laser treatment. First surgically a "flap" of corneal tissue less than a third the thickness of a human hair is created the flap to one side is lifted. Laser energy is applied to reshape the cornea according to carefully calculated measurements. When treating nearsightedness, laser is used to decrease the cornea's relative curvature. When treating farsightedness, the cornea's relative curvature is increased and then the corneal flap is repositioned. A naturally-adhering bandage, the flap helps to improve results and speed recovery. LASIK may be used for nearsightedness, nearsightedness plus astigmatism, farsightedness, and farsightedness plus astigmatism.

In PRK, or photorefractive keratectomy, the laser is applied directly to the cornea according to carefully calculated measurements, without creating a flap. For nearsightedness the relative curvature is decreased; for farsightedness the relative curvature is increased. At the conclusion of the procedure a transparent "bandage" is placed on contact lens over the cornea to promote healing. PRK is presently used to treat nearsightedness, nearsightedness plus astigmatism, farsightedness, and farsightedness plus astigmatism.

Our specialists at Netra Jyoti Kendra, Faizabad will test your eyes completely using the best in class eye equipment and suggest a treatment that suits you the best.